<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="selAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody align="center">
        <tr
          is="gwc2-cmp"
          v-for="(item, index) in goodList"
          :key="index"
          :item="item"
          @del="del"
        ></tr>
      </tbody>
      <tfoot align="center">
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ total }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import Gwc2Cmp from './gwc2_cmp.vue'
export default {
  name: 'Gwc2',
  components: {
    Gwc2Cmp,
  },
  data() {
    return {
      goodList: [
        {
          name: '诸葛亮',
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: '蔡文姬',
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: '妲己',
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: '鲁班',
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    }
  },
  computed: {
    total() {
      return this.goodList.reduce((acc, cur) => {
        if (cur.checked) {
          acc = acc + cur.price * cur.num
        }
        return acc
      }, 0)
    },
    selAll: {
      get() {
        // 有假即假，所有为真才是真
        return this.goodList.every((item) => item.checked)
      },
      set(val) {
        this.goodList.forEach((item) => (item.checked = val))
      },
    },
  },
  methods: {
    del(itemData) {
      const idx = this.goodList.findIndex((item) => item === itemData)
      this.goodList.splice(idx, 1)
    },
  },
}
</script>

<style></style>
